Golem, Web (CR 7)

Large Construct
Alignment: Always neutral
Initiative: +3 (Dex)
Languages: Cannot speak

AC: 20 (-1 size, +3 Dex, +8 natural), touch 12, flat-footed 17
Hit Dice: 11d10+30 (90 hp); DR: 10/adamantine
Fort +3, Ref +6, Will +3
Speed: 30 ft.
Space: 10 ft./10 ft.
Base Attack +8; Grapple +17
Attack: Slam +12 melee
Full Attack: 2 slams +12 melee and bite +7 melee
Damage: Slam 2d10+5, bite 1d6+2 plus poison
Special Attacks/Actions: Poison, web
Abilities: Str 20, Dex 17, Con -, Int -, Wis 11, Cha 1
Special Qualities: Adhesive, construct traits, fast healing 5, immunity to magic, spider climb, vulnerability to fire
Feats: -
Skills: Hide -1*
Advancement: 12-16 HD (Large); 17-22 HD (Huge)
Climate/Terrain: Any
Organization: Solitary (often with a Huge monstrous spider) or gang (2-4 plus 2d4 Huge monstrous spiders)
Treasure/Possessions: None

Source: Monster Manual III

Adhesive (Ex): The webbing that makes up a web golem is extremely sticky. A web golem automatically grapples any creature it hits with a slam attack. Such creatures cannot get free while the web golem functions without removing the web adhesive first. A web golem makes a free bite attack against any creature it grapples each round. While it grapples a creature, it can use its normal attack to deal bite or slam damage to the grappled creature, or it can attempt to attack another creature with a bite or slam attack. The web golem cannot grapple more than one creature at a time.

Fire or acid damage causes the web golem's adhesive ability to stop functioning for 1d4 rounds. When the web golem's adhesive ability fails, foes already grappled by a web golem can escape from the grapple normally (with a successful grapple or Escape Artist check). A web golem can release a grappled creature normally or not grapple a foe it strikes if it wishes.

Construct: Immune to mind-influencing effects, poison, disease, and similar effects. Not subject to critical hits, subdual damage, ability damage, energy drain, or death from massive damage.

Fire Vulnerability (Ex): A web golem takes double damage from fire attacks unless a save is allowed for half damage. A successful save halves the damage, and a failure doubles it.

Magic Immunity (Ex): A web golem is immune to all spells, spell-like abilities, and supernatural effects, except as follows. A grease spell slows it (as the slow spell) for 2d6 rounds, with no saving throw. While within the area of a web spell, a web golem gains fast healing 5.

Poison (Ex): Bite, Fortitude save (DC 14); initial and secondary damage 1d6 Strength.

Appropriately, web golems can utilize many of the same tactics that a giant spider would. They are usually posted high on the ceiling, nestled among other spider webs, waiting for intruders.